Former U.S. Environmental Protection Agency (EPA) official Jess Rowland may have to testify over claims that he covered up evidence that glyphosate , the main ingredient in Monsanto 's top-selling herbicide Roundup, could cause cancer. A federal judge said at a hearing in San Francisco on Monday that he is likely to grant the deposition of Rowland, a key figure named in multi-district cancer lawsuits alleging that Monsanto failed to warn about the cancer risks associated with exposure to glyphosate. "My reaction is when you consider the relevance of the EPA's reports, and you consider their relevance to this litigation, it seems appropriate to take Jess Rowland's deposition," U.S. District Judge Vince Chhabria said at the hearing. The plaintiffs' lawyers argue that Rowland had a "highly suspicious" relationship with Monsanto, Bloomberg reported. Rowland, a former deputy di...